Vulcanization



April 5, 1927. 1,23,183

D. E. HENNESSY VULCANIZATION Filed Aug. 19, 1922 DANIEL E. HENNESSYINVENTOR A ORNEY Patented Apr. 5.192%

STATES PATENT OFFICE.

DANIEL E. HENN ESSY, OF MILWAUKEE, WISCONSIN,ASSIGLNOR TO THE FISKRUBBER COMPANY. OF cmcornn cnusmcrs.

FALLS, MASSACHUSETTS,- A CORPORATION OF MASSA- VULCANIZATION.

Application filed August 19, 1922. Serial No. 582,957.

My invention relates to curiiig, more particularly to curing 'lIlllCltubes without a cross-wrapper, and the principal ob ect at my inventionis to provide a new and img proved method of so curing such tubes.

In the drawings accon'ipauying this specification and 'lormimg a partthereof I have shown, for purposes of illustration one form which myinvention may assume. In these The single figure is a. perspective Viewof this illustrative embodiment. In the drawings I have shown a heater11 having a pair of channels 12 adapted to rea' eeive the rollers 13 ofthe tarriage 14 which is adapted to carry a plurality of mandrels 15about each or" which is encircled the raw stock 16 which may be woundupon the mandrels in the usual way, cross-Wrapped at the ends only, andcuredxiuopen heat.

in curing tubes in this manner considerable dilliculty has beenexperienced with seam n1arl-:=. Upon investigation I find that this islargely due to the opening of the splice under the action of gravityafter the mandrel the the stock has been softened by heat and before ithas vulcanized. I find, however, that it the splice is placed directlyabove weight of the stock will cause the overlapping edge to merge, whensoftened, into the wall of the tube to present a tube uumarred by scammarks and tightly spliced.

I have disclosed aspecific embodiment of my invention but thisdisclosure is illustrative only and my invention is not limited thereto.

I claim:

'1. The method of vulcanizing inner tubes in open heatcomprising placingthe splice 40 directly above the mandrel so that when the rubber softensthe edtre of the splice will merge into the Walls of said tube to form atube of substantially smooth surface.

2. The method of vulcanizing inner tubes comprising placing the splicedirectly above the mandrel and curing in open heat.

In testimony whereof I have signed my name to the above specification.

DANIELE. HENNESSY.

